Design of tunable infrared absorber based on Au/VO2 nanostructures
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School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology; Shanghai Key Laboratory of Modern Optical System,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology; School of Electric and Information, Shanghai University of Electric Power,School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology; College of Medical Imaging, Shanghai University of Medicine DdDd Health Sciences

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    Abstract:

    An infrared absorber based on Au/VO2 periodic square hole array is designed in this paper. The effects of structural parameters on the absorption spectrum were calculated by the finite difference time domain method. The theoretical simulation results show that the absorption tunability was the most obvious at Au film thickness of 80nm and VO2 film thickness of 140nm, and the square hole length and array period were 1.1μm and 1.2μm, respectively. The absorption difference between high and low temperature can reach to 80.3% at 2.3μm. Considering the different polarization and incident angles, it is evident that the absorber was polarization-independent at normal incidence and wide angle at oblique incidence. The angular dependence was much stronger in TE polarization compared with TM polarization. In addition, the absorber presented strong absorption because of the highly localized electromagnetic field distribution under low temperature, but the electromagnetic fields are located at the surface at high temperature, which lead to suppressed absorption. The absorber can be applied to new tunable intelligent photovoltaic device due to the advantages of high absorption efficiency, tunable absorption intensity, and easy implementation.

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WU Zheng-Yi, LI Yi, CHEN Pei-Zu, JIANG Wei, XU Ting-Ting, LIU Zhi-Min, ZHANG Jiao, FANG Bao-Ying, WANG Xiao-Hua, XIAO Han. Design of tunable infrared absorber based on Au/VO2 nanostructures[J]. Journal of Infrared and Millimeter Waves,2016,35(6):694~700

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History
  • Received:April 21,2016
  • Revised:September 29,2016
  • Adopted:July 01,2016
  • Online: December 06,2016
  • Published:
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